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In this photo taken on May 15, 2020, doctors perform tracheal intubation of a coronavirus patient on artificial lung respiration at an intensive care unit of the Filatov City Clinical Hospital in Moscow, Russia. (AP Photo/Pavel Golovkin)

In this photo taken on May 15, 2020, doctors perform tracheal intubation of a coronavirus patient on artificial lung respiration at an intensive care unit of the Filatov City Clinical Hospital in Moscow, Russia. (AP Photo/Pavel Golovkin)